feat: Adds CAIP-122 standard for XRP Ledger.

[antondalgren]

Aligned with the ripple-keypairs implementations for signing and verification.

[antondalgren]

Any news on this @bumblefudge?

[bumblefudge]

LGTM with minor edits, which i left on your fork. Are there already public and open source implementations of this that you can link to from the # References section? If so, please add in the form:

[name of implementation]: link to git repository {...}

• [name of implementation]: Sample implementation by {organization(s)} [, live at {url}]

[antondalgren]

Thank you!

Currently there are no reference implementations for this @bumblefudge